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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Data Communications - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC U0076 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON/Vehicle In Service Mode.
  2. Verify that the scan tool is communicating with vehicle.
    • Go to next step: If the scan tool is communicating with vehicle 
  3. Attempt to communicate with all devices on the Powertrain CAN bus. Refer to Data Link References to determine how many devices should be communicating on the Powertrain CAN bus.
  4. Verify two or more devices are not communicating on the Powertrain CAN bus.
    • If only one device is not communicating 

      Refer to Circuit/System Testing - Testing the Device Circuits  .

    • Go to next step: If two or more devices are not communicating 
  5. Refer to Circuit/System Testing - Serial Data Starting Point  .
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